Error Message OX643

Hi,

I have Windows XP, Media Center Edition, Version 2002. When I have tried to
update the "Security Update for Microsoft, Net Framework, Version 1.1 Service
Pack UKB886903," I receive Error Message Ox643. There is no information on
this error message under the Trouble Shooting or Frequently Asked Questions
section. Can anyone help?

Thank you.
--
Jakejohnson